Answer:
The Yankees lost 20% of their games.
Explanation:
We need to find the percentage of what games the Yankees lost.
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We need to figure out what percentage of 64 is part of 80 (the winning percentage) first.
We would have to divide 64 by 80 and the multiply the quotient by 100.
The Yankees won 80% of the games.
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To find the losing percentage we have to subtract 80% from the 100% of the games.
100% - 80% = 20%
The Yankees lost 20% of the games.
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Hope this helps!